19. A thermo-dynamical system is changed from
(a) ΔQ (b) ΔW
(c) ΔQ + ΔW (d) ΔQ-ΔW
Ans. d
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)